![]() ![]() The top and bottom lintel rebar must extend at least 24” (610mm) beyond both sides of window and door openings.Insulated concrete forms, or ICFs, are for cast-in-place reinforced concrete walls. Use stirrups to hang the lower lintel rebar from the upper lintel steel, making sure the bottom rebar is 1-1/2 to 2-1/2 inches (38 to 64 mm) above the buck material.Ĭonsistent stirrup type (S-stirrup or C-stirrup) and dimensions will maximize efficiency. Install a row of forms across the top of the buck. There should be 1-1/2” to 2-1/2” (38 to 64 mm) from buck material. Check to make sure the lower lintel steel has enough clearance from buck material. This provides easier access to rebar for fast lintel steel installs. ![]() Be sure to consult engineer specs when placing reinforcement for windows and doors.īefore placing ICF forms over top of door or window bucks, rest the lower lintel bar on buck material. In many cases rebar is also required to be placed below windows. It is the responsibility of the installer to verify table rebar specifications to comply with local building codes and engineer specs.Īppropriate lintel rebar should be placed in the proper sequence directly above doors and windowsto carry loads over these openings. STEP 4Ĭold joints between upper floor walls and lower floor walls need to be reinforced with a lap length of at least 24” (610 mm), unless otherwise specified. Place vertical rebar on each side of every opening as required. Place vertical reinforcement under windows, if required. Install vertical rebar, as required, after all courses and horizontal reinforcement have been placed. Vertical rebar diameter will dictate horizontal offset from course to course. This allows ideal support and positioning for vertical steel. The groove pattern on most ICF webs allow for horizontal rebar to be alternated in location, row by row (typically inside and middle respectively). A contact lap splice is recommended, as it will reduce the areas for concrete to become dammed up, which would result in improper flow and placement during the pour. Maintain the proper overlap splice length of 24” (610mm) lap length, or as otherwise specified when placing horizontal rebar. Secure the rebar away from door and window openings by 2” (51mm). ![]() Horizontal rebar, sized as required, should be placed in the wall as each course is installed. Both horizontal rebar and vertical rebar is used within the concrete core of ICF builds. The rebar sizes which are most commonly used in residential concrete construction are: 10mm and 15mm. It is the responsibility of the installer to verify rebar specifications with local building codes and engineer specs. Reinforcing steel must meet the requirements of ASTM A615, ASTM A996, or ASTM A706 for low-alloy steel. Always check ICF manufacture engineer specs to ensure proper size, amount, and location of rebar is being placed. Reinforcement around windows and doors needs to be installed as required. Rebar and concrete have the same expansion and contraction rate caused by temperature changes while concrete is very strong under compressive loads it lacks strength to resist tensile forces, which is why rebar is necessary as it has the opposite strengths and weaknesses.Ī non-contact splice is typically the splice of choice in ICF walls except in heavily reinforced walls or in cases of narrow wall cavities. Reinforcing steel (rebar) strengthens concrete walls to help minimize cracking and buckling under load due to backfill, wind, and various other loads. ![]()
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